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sclass BEACalculations {
  GazelleBEA mod;
  
  *(GazelleBEA *mod) {}
  
  void reactAllInputsWithSomePatterns() {
    for (BEAObject input : mod.beaObjectsOfType("input")) {
      new ReactInputWithSomePatterns r;
      r.input = input;
      r.ccOut = db_mainConcepts();
      r.max = 10;
      r.start();
      stepAllWithTimeout(10.0, r);
    }
  }
  
  class ReactInputWithSomePatterns implements Steppable {
    BEAObject input;
    Concepts ccOut;
    int max = 3, n;
    Iterator<BEAObject> patterns;

    void start {    
      n = countConceptsWhereIC(ccOut, BEAObject, +input, type := "match");
      patterns = iterator(sortByConceptID(conceptsWhereIC BEAObject(type := "Pattern")));
    }
    
    public bool step() {
      if (n >= max) false;
      if (!patterns.hasNext()) false;
      if (reactInputWithPattern(input, patterns.next(), ccOut) != null)
        ++n;
      true;
    }
  }

  SS matchInputWithPattern(BEAObject input, BEAObject pattern) {
    S text = getString text(input);
    ret matchInputWithPattern(text, pattern);
  }
    
  SS matchInputWithPattern(S text, BEAObject pattern) {
    S pat = getString text(pattern);

    SS mapping = flexMatchAngleBracketVarsIC_honorPunctuation_first(pat, text);
    if (mapping != null) ret mapping;
    ret flexMatchAngleBracketVarsIC_first(pat, text);
  }
  
  BEAObject reactInputWithPattern(BEAObject input, BEAObject pattern, Concepts ccOut default db_mainConcepts()) {
    if (input == null || pattern == null) null;
    SS mapping = matchInputWithPattern(input, pattern);
    //printVars_str("reactInputWithPattern", +input, +pattern, +mapping);
    if (mapping == null) null;
    ret cnew(ccOut, BEAObject,
      type := "Match",
      +input,
      +pattern,
      +mapping);
  }
  
  O serveAnalyzeInput(GazelleBEA.Req req) {
    new Concepts ccOut;
    BEAObject input = getConcept BEAObject(parseLong(req.get("id")));
    if (input == null)
      input = cnew(ccOut, BEAObject, type := "Input", text := req.get("q"));
    S text = getString text(input);
    new ReactInputWithSomePatterns r;
    r.input = input;
    r.ccOut = ccOut;
    r.max = 1000;
    r.start();
    stepAllWithTimeout(10.0, r);
    L matches = conceptsWhereIC(ccOut, BEAObject, type := "Match");
    ret h1_title("Analyze Input")
      + p("Input: " + b(htmlEncode(text)))
      + p(empty(matches) ? "No matches" : "Matches")
      + ul_htmlEncode(matches);
  }
  
  O serveQueryPage(GazelleBEA.Req req) {
    S q = req.get("q"), algorithm = req.get("algorithm");
    
    Map<S, IF0<Algorithm>> algorithms = litorderedmap(
      "Reverse input (test algorithm)" := (IF0) () -> new ReverseInput,
      "Timeout test" := (IF0) () -> new TimeoutTest,
      "Run pattern" := (IF0) () -> new RunPattern,
      "Find rewrites for match" := (IF0) () -> new FindRewrites,
      "Process new input" := (IF0) () -> new ProcessNewInput,
    );

    S output = empty(algorithm) ? null : doAlgorithm(algorithms, algorithm, q);
    
    ret hcenter3(
        htitle_h2("Gazelle BEA Query")
      + hform(p("Query: " + htextfield(+q, style := "width: 300px; text-align: center") + " &nbsp; Algorithm: " + hselect_list(keys(algorithms), algorithm, name := "algorithm") + " &nbsp; " + hbutton("Go"))))
      + (output == null ? "" : h3(algorithm) + output);
  }
  
  S doAlgorithm(Map<S, IF0<Algorithm>> algorithms, S algorithm, S q) {
    StringBufferWithMaxSize out = new(100000);
    
    IF0<Algorithm> algo = lookupPossiblyCI(algorithms, algorithm);
    if (algo == null)
      out.append("Algorithm not found: " + algorithm);
    else {
      if (isB(evalWithTimeout(10.0, r {
        Algorithm alg = algo!;
        alg.q = q;
        alg.out = out;
        alg.run();
      })))
        out.append("\n[algorithm timeout]");
    }
    
    ret str(out);
  }
  
  abstract sclass Algorithm implements Runnable {
    S q;
    Appendable out;
    
    void appendHTML(S html) ctex {
      out.append(html).append("\n");
    }
    
    void appendText(S text) ctex {
      out.append(hpre_htmlencode(rtrim(text)));
    }
    
    void appendTextBold(S text) ctex {
      out.append(b(hpre_htmlencode(rtrim(text))));
    }
  }
  
  class ReverseInput extends Algorithm {
    run { appendText(reversed(q)); }
  }
  
  class TimeoutTest extends Algorithm {
    run { sleepSeconds(120); }
  }
  
  class RunPattern extends Algorithm {
    new L<Runnable> nonMatches;
    
    run {
      BEAObject pattern = mod.beaGet(parseFirstLong(q));
      if (pattern == null) ret with appendText("Pattern not found");
      appendText("Pattern: " + pattern);
      for (BEAObject input : mod.beaList("Input")) {
        S text = input.text();
        SS mapping = matchInputWithPattern(input, pattern);
        if (mapping == null)
          nonMatches.add(r {
            appendText("Checking Input: " + input + " - No match");
          });
        else {
          S result = "\n" + indent(formatDoubleArrowMap_horizontallyAligned(mapping));
          appendText("Checking Input: " + input + result);
          S url = appendParamsToURL(mod.baseLink + "/storeMatch", pattern := pattern.id, input := input.id);
          appendHTML(
            hbuttonLink(appendParamsToURL(url, label := "good"), "Good match") + " "
            + hbuttonLink(appendParamsToURL(url, label := "bad"), "Bad match"));
        }
      }
      
      callFAll(nonMatches);
    }
  }

  class FindRewrites extends Algorithm {
    run {
      // argument is ID of a match
      BEAObject match = mod.beaGet(parseFirstLong(q));
      if (match == null || !match.typeIs("Match")) ret with appendText("Match not found");
      BEAObject pattern = cast cget pattern(match);
      BEAObject input = cast cget input(match);
      SS mapping = cast get mapping(match);
      appendText("Match: " + match);
      appendText("Input: " + input);
      appendText("Pattern: " + pattern);
      appendText("Mapping:\n"
        + indent(formatDoubleArrowMap_horizontallyAligned(mapping)));
        
      Cl<BEAObject> rewrites = mod.findBEABackRefs(pattern, "Rewrite");
      for (BEAObject r : rewrites) {
        S text = r.text();
        S text2 = replaceAngleBracketVars(text, mapValues curly(mapping));
        appendText(" Using pattern rewrite: " + text);
        appendTextBold(
            "    " + input.text() + "\n"
          + " => " + text2);
          
        // look for existing rewrite
        BEAObject existing = conceptWhereIC BEAObject(
          type := "Rewrite", +input, text := text2,
            +match, patternRewrite := r, label := "good"
        );
        
        if (existing != null)
          appendHTML("Rewrite exists: " + mod.beaLinkHTML(existing));
        else
          appendHTML(
            hinlinepostform(
              hhiddenMulti(
                action := "create",
                f_type := "Rewrite",
                f_text := text2,
                f_input := input.id, metaInfo_input := "concept",
                f_match := match.id, metaInfo_match := "concept",
                f_patternRewrite := r.id, metaInfo_patternRewrite := "concept",
                f_label := "good")
              + hbutton("Good rewrite"),
              target := "_blank",
              action := mod.crudLink(BEAObject)));
      }
    }
  }
  
  class ProcessNewInput extends Algorithm {
    new L<Runnable> nonMatches;
    
    run {
      q = trim(q);
      appendText("Input: " + q);
      
      BEAObject input = conceptWhereIC(BEAObject, type := "Input", text := q);
      
      appendHTML(input != null
        ? "Input exists: " + mod.beaLinkHTML(input)
        : hinlinepostform(
            hhiddenMulti(
                action := "create",
                f_type := "Input",
                f_text := q)
              + hbutton("Save input"),
              target := "_blank",
              action := mod.crudLink(BEAObject)));

      for (BEAObject pattern : mod.beaList("Pattern")) {
        S text = input.text();
        SS mapping = matchInputWithPattern(q, pattern);
        if (mapping == null)
          nonMatches.add(r {
            appendText("Checking Pattern: " + pattern + " - No match");
          });
        else {
          S result = "\n" + indent(formatDoubleArrowMap_horizontallyAligned(mapping));
          appendText("Checking Pattern: " + pattern + result);
          /*S url = appendParamsToURL(mod.baseLink + "/storeMatch", pattern := pattern.id, input := input.id);
          appendHTML(
            hbuttonLink(appendParamsToURL(url, label := "good"), "Good match") + " "
            + hbuttonLink(appendParamsToURL(url, label := "bad"), "Bad match"));*/
        }
      }
      
      callFAll(nonMatches);
    }
  }
} // end of Calculations